From the introduction:

The author believes, along with several other well known professional magicians, that it is one of the cleanest cut color changing routine to be obtained, and in closing wishes to thank Mr. William H. Hanna for the valuable assistance given, with several of the moves and the fine illustrations in this book.

1st edition 1936, 10 pages; PDF 8 pages.
word count: 1775 which is equivalent to 7 standard pages of text